Mince, I'm presuming this request is a tongue-in-cheek attempt to rankle the cartoonists who visit this site.
For those not in the know, this is probably the number one bugbear in our profession. "You're a cartoonist? Could you dash off a couple of your doodles for me? My son loves surfing. Could you draw him on a surfboard in his Arsenal shirt, waving to the rest of us on the beach? And make me wearing a Tottenham shirt---that'll be really funny!"
Needless to say, a fee for this is never mentioned. The assumption is that no time is involved, we do it for a laugh and we'll happily work for nothing.
This assumption is not correct.